import { LogicalExpression } from 'fusefx-repositorycontract';
import { FieldPredicate } from 'fusefx-repositorycontract/lib/FieldPredicate';
export declare function isExpressionValid(e: LogicalExpression | null | undefined): boolean;
export declare function isRelationValid(r: FieldPredicate): string;
export declare function getEmptyRelationElement(): FieldPredicate;
export declare function getEmptyExpression(): LogicalExpression;